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  "limitations": [
    "Bounded 12-square-kilometre central Cologne supplement, not citywide coverage.",
    "Official standardized LoD2 roofs and measured model heights; no facade survey or photogrammetry.",
    "Official elevations normalized per building; runtime placement uses local modeled terrain.",
    "OSM IDs and collision footprints retained; official geometry may differ by up to 0.6 metres.",
    "Dedicated landmark models and excluded underground/building-part geometry retain existing handling.",
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  "licenseDisclosure": {
    "originalSource": {
      "license": "Datenlizenz Deutschland – Zero – Version 2.0",
      "licenseUrl": "https://www.govdata.de/dl-de/zero-2-0",
      "scope": "Original Geobasis NRW CityGML files before OSM matching."
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      "license": "ODbL-1.0",
      "licenseUrl": "https://opendatacommons.org/licenses/odbl/1-0/",
      "attribution": "© OpenStreetMap contributors; Geobasis NRW",
      "scope": "The published supplement retains OSM identifiers and uses OSM footprint matching. It is offered as an OSM-derived database under ODbL 1.0; this does not change the terms of the original NRW files."
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}